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I purchased this battery kit to extend the flight time of my Alien Xk 250 a.k.a Aukey Mohawk quadcopter even though it isnt advertised for it specifically but it is a almost perfect fit for the XK250 as it has same dimensions as the OEM battery and only about 1mm thinner.Build Quality & Packaging---------------------------------- The entire kit comes nicely packed with each of the 5 LiPo batteries individually wrapped and boxed- The 5 Port charger , JST connector cables and the Micro USB cable also come in their own individual packing- The batteries definitely feel that they are well make and match my OEM 780 mAh battery in terms of build quality- The charger feel that its cheaply made with cheap looking plastic & uneven LED indicators (see pic) that are not aligned with the center correctlyBatteries-------------These batteries are advertised to have a capacity of 780 mAh, however this rating is over optimistic as they are thinner than my OEM batteries and I also tested their true capacity by draining them completely and used a Drok USB Multimeter to measure their true capacityAdvertised Capacity = 780 mAhMeasured Capacity = 686 mAh (87% of advertised capacity)This in itself is not a terribly bad result considering that LiPo batteries degrade over tiime (even when they are not in use) , but I would have liked to see a slightly higher number.Charger & JST Connectors------------------------------------- The best aspect of the charger , despite its middling build quality, is that it is able to charge batteries both with JST type connectors (common to many WLtoys Quads) with the help of the included JST cables, and also charge batteries with Losi type connectors (common to JJRC, Hubsan, Syma quadcopters)- I had no issues charging my X250 battery with JST connectors and my Eachine H8 Mini battery with Losi connectors at the same time . And between these two connector types you are covered for a huge chunk of quadcopters and batteries out there . So you dont have to worry about purchasing separate chargers- Upon using the charger for the first time, it gave off of a weird burning smell , which looked like it came from excess glue/solder paste evaporating with the heat.- The charger stops charging each of the individual batteries once they are fully chargedOverall I can recommend this quadcopter battery kit as its reasonably priced, has well built LiPo batteries, JST to Losi connectors and a Universal LiPo charger as well

Ok.

great product well made

I got the batteries in two days. They came almost charged, they ran my little drone for way longer the the little stock battery it came with. So I'm sure I'll be doing an update in a few weeks or so.Size. In inch's 2"x1 1/8"x 1/4"Charger is the same size just 1/4" thicker and uses a micro USB to charge it so super easy.

great item. just as described.